Adds kWillProcessAccelerator_KeyEventProperty

ash/public/interfaces/event_properties.mojom

Index: ash/public/interfaces/event_properties.mojom
diff --git a/ash/public/interfaces/event_properties.mojom b/ash/public/interfaces/event_properties.mojom
new file mode 100644
index 0000000000000000000000000000000000000000..44ad368759377b71e4dc528553ca65ce513c4451
--- /dev/null
+++ b/ash/public/interfaces/event_properties.mojom
@@ -0,0 +1,13 @@
+// Copyright 2017 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+module ash.mojom;
+
+// This is added to KeyEvents that ash has an accelerator for. This is only used
+// for accelerators ash does not handle immediately. That is, those the target
+// is given priority to process.
+// No value is set for this property, the presence indicates ash has an
+// accelerator.
+const string kWillProcessAccelerator_KeyEventProperty =
+  "ash:will-process-accelerator";